Class IX

A hydrogen atom is
  1. 8.40% as massive as C-12
  2. 10% as massive as C-12
  3. 20% as massive as C-12
  4. 30% as massive as C-12
A substance whose all atoms have same atomic number is
  1. molecule
  2. atom
  3. element
  4. ion
Number of atoms in 5 moles of nitrogen atom is
  1. 3.01 * 1024
  2. 4.1 * 1030
  3. 3.9 * 1032
  4. 5 * 1056
Number of protons and neutrons in nucleus if atomic number of element is 17 and mass number is 35, is
  1. 17 and 18
  2. 17 and 19
  3. 17 and 20
  4. 17 and 21
Mass of carbon present in 44g of carbon dioxide is
  1. 12g
  2. 6g
  3. 24g
  4. 44g
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LKG - 12th

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